Control for riveting devices



Dec. 12, 1944', Q PETERS CONTROL FOR RIVETIVNG DEVICES Filed May 15, 1945 49 5 0 5 32 s 4 24 2 24 $3 8 5 a 9 7 4 M 3. Z R a a 5 3 m 5 5 7 l 3 4 m e m w n I 5 w M 3 2 6 .4 l 5 6 lNVE NTOR 07"20 H. Fefer'a Patented Dec. 12, 1944 7 2,364,750 CONTROL FOR RIVETING DEVICES Otto A. Peters, Toledo, Ohio, assignor to Willys- Overland Motors, Inc., Toledo, Ohio, a corporation of Delaware Application May 15, 194$,Serial No. 487,413

Claims.

This invention relates to improvements in control mechanism for riveting apparatus and more especially to means for pre-determining or timing the duration of each riveting operation.

The invention comprehends the provision of means associated, with the control valve mechanism of fluid actuated riveting apparatus whereby successive riveting operations may be of substantially uniform duration.

An object of the invention is the provision of means, set into action by the operator in moving the control valve to actuate the riveting apparatus whereby the valve is automatically closed after a pre-determined lapse of time thus securing uniformity in successive riveting operations.

Another object of the invention is the provision of a simple yet effective means which may be afiixed to or associated with conventional riveting devices for controlling or determining the effective strokes of the riveting device occurring in each riveting operation.

Another object resides in a device of this character whereby the period of duration ,of riveting operations may be regulated.

Still another object of the invention is the provision of control valve damping or delaying means which, when initiated into operation by the.

operator, automatically determines the length of time that the riveting device is in operation without further act on the part of the operator.

Still a further object is the provision of control -means for riveting devices whereby uniformity in successive riveting operations may be attained by unskilled operators and whereby riveting operations of uniform character may be had, thus substantially eliminating spoilage of work.

Further objects and advantages are within the scope of this invention such as relate to the arrangement, operation and function of the related elements of the structure, to various details of construction and to combinations of parts, elements per se, and to economies of manufacture and numerous other features as will be apparent from a consideration of the specification and drawing of a form of the invention, which may be preferred, in which: 4

Figur 1 is a side elevational view partly in section showing my invention associated with a riveting device; a

Figure 2 is an enlarged fragmentary sectional view taken substantially on the line 2-2 of Figur 1;

Figure 3 is a fragmentary detail sectional view taken substantially on the line 3--3 of Figure 1;

Figure 4 is a sectional view taken substantially on the line 4-4 of Figure 3.

While I have shown the arrangement of my invention as used with a riveting device it is to be understood that I contemplate the incorporation of the invention in any arrangement where it may be found to have utility.

Referring to the drawing in detail, there is illustrated a riveting device or gun of the fluid actuated type which is inclusive of a barrel shaped At the threaded a coil-like member i5 fabricated of spring wire or similar material. The member l5 serve to position and secure at the extremity of the body l0 a riveting die IE, or other tool which may be utilized with the riveting device. The body Ill of the riveting device contains the riveting or actuatin hammer and its associated mechanism (not shown) of conventional design which is arranged to be actuated by fluid means, as for example, compressed air.

The grip portion II contains valve mechanism for controlling or regulating the flow of compressed air to the mechanism contained in the body I0 of th riveting device. The grip portion I I is formed with a bore l8 within which is contained a valve cage or sleeve ill. The sleeve is snugly fitted into the bore l8 and frictionally retained therein. Contained within the hollow interior of the sleeve I9 is a reciprocable valve or plunger 22 which is formed with portions 23 and 24 having only sufficient clearance as to be slidably reciprocable with the sleeve. The valve 22 is normally urged to its uppermostposition by means of an expansive coil spring 26, the tension on the spring being controllable by adjustment of a plug or abutment 2l threaded into the lower portion of the bore l 8.

Formed on the valve member 22 above portion 24 is a pair of projections 29 and arranged be tween the projections is a roller 30 rotatably mounted upon a suitable'pin or stub shaft 33 the latter projecting into aligned openings in the projections 29. The bore l8 at its upper end registers with a transversely extended channel 34 in which is slidab-ly positioned a valve actuating member 35 having a finger portion 36 extending exteriorly of the grip portion II. The valve actuating member 35 i formed with an angularly inclined or cam surface 38 adapted when member 35 is moved inwardly of the grip portion to engage roller 30 and cause the valve member 22 to move downwardly and open the valve mechanism.

The sleeve I9 is formed with ports or openings 40 in communication with a channel or duct 4| through which the actuating medium, as for example, compressed air is conveyed to the riveting hammer (not shown) contained within the body ID. The sleeve I9 is provided with a'sec- 0nd series of ports or openings 42 in communication with a channel or duct 43 in the lower end of which is embodied a fitting 44 to which an air conveying hose 45 is connected. Contained comprises a pair of bands or clamps 41 and 48.

surrounding the body of the riveting device.

' Connected to band 41 is a pair of links 50 forming a part of the frame structure and are secured to the band 4'! by means of a bolt 5!. Se-, cured to. the band 48 by means of a bolt 52 is one end of a link or strut 53 having its other end connected to the bars or links 56 by means of a bolt 54. A relatively movable link 5t is pivoted for movement about the axis of the bolt 52, the link 56 being connected by suitable means, as for example, a-bar 5'! to. the valve actuating member 35 by means of members or bolts 58and59.

Pivotally articulated to the frame links 56 by means of a bolt 6| is a cylinder head or member 62 which is interiorly bored to receive a cylinder'63 which is pressed into the-head. The head 52 is provided with an air vent or orifice 6A which is provided with a regulating needle or valve 65 threaded into an opening in the head 62 which may be adjusted to regulate the efiective opening of the vent 64.

Slidably positioned with the cylinder 63 is a plunger or piston 6'! formed of leather or other suitable material and which normally snugly contacts the walls of the cylinder. Positioned on either side of the leather plunger or piston 61 are washers 68 and GBpreferably of metal. A- rod 16 is formed with a threaded tenon portion 72 which extends through registering openings in washers 68, t9, and. piston 61 and is adapted to receive a securing nut 66 to hold the washers and piston in assembled relation upon the piston rod 16. The other end of piston rod 10 is pivotally connected to the lower extremity of 56 by means of a bolt H. The one end of the cylinder 63 is provided with an inwardly turned flange 66 having a central opening to receive and guide the piston rod 16. Interposed between. the washer 69 and the flange 66 is an expansive coil spring 73 for normally urging the piston '67 toward the end'of the cylinder as illustrated in Figure l. 1

The washer 68 adjacent'to the piston 61 isprovided with a frusto-conical opening which is normally closed by a complementary shaped valve member M. Valve member 14 has a stem 86 encircled by a spring 75 normally the valve M toward closed position. The wall of the cylinder adjacent to head 62 is provided with longitudinally extending groove or by-pass 'I'! for permitting the by-pass of air around the piston when it has reached a predetermined position in the cylinder 63 during its return movement.

The link 56 is preferably provided with a handle or trigger portion 18 formed of plastic or other suitable material which may be conveniently gripped by the operator in using the riveting gun.

The operation of the arrangement of my invention is as follows: The operator in using the riveting device places the latter in a position wherein the riveting die l6 engages a rivet to be driven.- With the device in this position the operator grips the trigger l8 and exerts a counterclockwise movement to the link 56 about the axis of the bolt 52 which movement actuates the link 51 and in turn the valve actuating member 35, moving the latter inwardly whereby the cam tel surface 38 of member 35 causes a downward tuates the piston rod 10 to move the piston 61 in a right'hand direction as viewed in Figure 1, the valve 14 and the flexible walls of the leather piston 61 permitting air to flow through the valve opening andperipherally of the piston into the cylinder. At the same time the spring 13 is compressed in the lower end of the cylinder 63 thus storing up energy for returning the piston to normal position when the operator releases the trigger orfinger grip 18.

The screw 65 is adjusted to permit a rate of air flow through orifice 64 sufiicient' to delay the closing of the valve 22 under the influence of spring 13, thus permitting operation of the riveting device during the movement of the piston from the right-hand end of the cylinder (as viewed in Figure 1) to the opposite end of the cylinder. By this means the valve 22 remains open for a period of time dependent upon the adjustment of the screw 6:5 which regulates the efiective area of-the air vent or orifice 64. It has been found extremely desirable to cause a substantially instantaneous closing of the air control valve 22 at the completion of a riveting operation. In the embodiment of my invention this is accomplished by means of the relief port or by-p-ass 11. When the piston in its retrograde movement moves past the by-pass or port H, the latter provides a channel permitting air to flow from the left hand side of the piston (as viewed in Figure 3) to the right hand side thereof. 1 This quickly equalizes the pressure, whereby the piston rapidly completes its return movement under the influence of spring 13, which results in a rapid closing of the valve member 22.

By the means of my invention herein before described, I am enabled to regulate accurately the period of time during which the riveting device is in operation. This means enables the setting of a number of rivets of identical size uniformly as each rivet received substantially the same number of blows in a given period of time. Moreover, by adjustingv the air vent regulating screw 65 a wide range of variation in delaying action of the valvemechanism is attainable for accomplishing either momentary or prolonged riveting as is desired.

It is apparent that, within the scope of the invention, modifications and different arrangements may be made other than is herein disclosed, and

the present disclosure is illustrative merely, the

invention comprehending all variations thereof.

What I claim is:

1. In combination with an air operated riveting device having an air control valve. a'valve accarried by the riveting device: a valve actuating member, associated with the riveting device for controlling the flow of actuating medium to the riveting device; a link connected to said valve actuating member; means including a cylinder and piston associated with said link for controlling the duration of opening of said valve; spring means for normally urging said piston toward valve closing position; an air vent in said cylinder; and means for adjusting the effective opening in said vent for regulating the rate of air flow therethrough.

3. A mechanism for. predetermining the period of operation of a riveting device having a housing and a control valve including, in combination, a support carried by the housing; a member for actuating the control valve to regulate theflow of actuating medium to the riveting device, motion retarding means including a cylinder and piston connecting said frame and said member for controlling the duration of the opening of said valve; and resilient mean for normally urging said piston toward valve closing position.

4. In combination with a portable air riveting device having a barrel-shaped housing and an air controlling valve, a valveactuating member; a frame carried by said housing,.linkage connected to said valve actuating member, a valve actuating member movement retarding means including acylinder connected to said frame, a piston reciprocable in said cylinder and connected to said linkage, a valve in said piston for permitting the flow of air through said valve when the piston is moved in one direction, spring means for normally urging the piston to one position in said cylinder; and a. by-pass arranged in the wall of said cylinder for establishing communication from one side of said piston to the other when the latter has been moved to a predetermined position in said cylinder. V

5. In combination with an air actuated riveting device having. a housing and an air controlling valve; a valve actuating member, a support associated with the housing of the riveting device, linkage connected to said valve actuating member, a motion retarding means including a cylinder connected to said support, a piston reciprocablejn said cylinder and connected to said linkage, an adjustable vent in said cylinder, a valve in said piston for permitting the flow of air through said valve when the piston is moved in one direction, spring means in said cylinder in engagement with said piston for normally urging the latter to one position, and a channel arranged in the wall of said cylinder for lay-passing air from one side of said piston to the other when the latter has been moved to a predetermined position in said cylinder.

6. In combination with a portable air actuated riveting device having a housing and an air controlling valve, a valve actuating member; a frame carried by the housing of the riveting device; linkage connected to said valve actuating member; a motion retarding means for said member including a cylinder connected to said frame, a piston reciprocable in said cylinder and connected to said linkage, an adjustable .vent in one end of said cylinder, a valve in said piston for permitting the flow of air through said valve when the piston is moved in one direction, spring means in said cylinder and adapted for engagement with said piston for normally urging the latter to one position, and a relief passage arranged in the wall of said cylinderfor by-pa ssing air from one side of said piston to the other when the latter has been moved to a predetermined position in said cylinder.

7. In combination with a riveting device of the fluid actuated type having a barrel-shaped housing and hand grip portion; a fluid control valve in said hand grip portion; a valve actuating member; a frame structure carried by said housing;

"means for manually moving said valve actuating member to open the fluid control valve to initiate the operation of said riveting device; means connecting said frame structure and said valve actuating member for retarding the return move-,,

ment of said valve actuating member toward valve closing position; and means for regulating the effective action of said retarding means.

8. In combination with a portable riveting device of the fluid actuated type having a barrelshaped housing and hand grip portion, a valve means connecting said frame structure and said valve actuating member for retarding the return movement of said valve actuating member toward valve closing position including a cylinder, a piston in said cylinder, resilient means in said cylinderfor, urging said piston toward one end of said cylinder, and means for regulating the rate of movement of said piston under the influence of said resilient means.

9. In combination with a portable air actuated riveting device having a housing and an air controlling valve; a valve actuating member; a frame structure carried by said housing, a cylinder connected to said frame structure; a link pivotally connected to said frame structure; a pistonrecipro'cable in said cylinder and having a piston rod extending exteriorly thereof; said piston rod being connected to said link, resilient means within said cylinder and engageable with the piston for urging the latter in one direction,'adiustab1e means for venting air from said cylinder for determining the rate of movement of the piston, a

second link connecting said first mentioned link and said valve actuating member whereby movement of said piston causes proportionately reduced movement of the valve actuating member.

10. In combination with a portable air actuated riveting device having a housing and an air controlling valve; a valve actuating member; a

frame structure carried by said housing; a cylinder articulately connected to said frame structure; a link pivotally'connected to said frame structure; a piston reciprocable in said cylinder and having a piston rod extendingexteriorly thereof; said piston rod being pivotally connect? .ed to said link, resilient means within said cylinder and engageable with the piston for urging the latter in one direction, adjustable means for,

venting air from said cylinder for determining the rate of movement of the piston; a second link pivotally connecting said valve actuating member to said first mentioned link and intermediate the ends of the latter whereby movement of said piston in said cylinder causes a corresponding but greatly reduced movement of said valve actuating member.

OTTO A. PETERS. 

